21130632 has 40 divisors (see below), whose sum is σ = 59187150. Its totient is φ = 7043328.

The previous prime is 21130619. The next prime is 21130649. The reversal of 21130632 is 23603112.

21130632 is a `hidden beast` number, since 2 + 1 + 1 + 30 + 632 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 4435236 = 4086^2 + 2106^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15657 + ... + 16952.

Almost surely, 2^21130632 is an apocalyptic number.

It is an amenable number.

21130632 is an abundant number, since it is smaller than the sum of its proper divisors (38056518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21130632 is a wasteful number, since it uses less digits than its factorization.

21130632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32627 (or 32614 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 21130632 is about 4596.8067177118. The cubic root of 21130632 is about 276.4633050177.

Adding to 21130632 its reverse (23603112), we get a palindrome (44733744).

The spelling of 21130632 in words is "twenty-one million, one hundred thirty thousand, six hundred thirty-two".